From patchwork Tue Sep 24 07:40:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13810435 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6B04F148316; Tue, 24 Sep 2024 07:41:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163695; cv=none; b=NqZ/LC6yf/atsrtMKu2Dx4qnPVkgoGBG3FD8TZzUwJYgZlRNDZJRLZ1l6Vty8Cslbys7/M/W8znAsrYZaR6UJetK3tdMhYrQQN6GSrE97uesXB8gWSmZCZjXjGhHrG1+N7f9uRNVvbzjxd4A0l00TGjVGxL01wx/3+yw2K98/bA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163695; c=relaxed/simple; bh=69Bnqoynyjn/q+9NvkuWoLJnxVVYEkGzpkA69xAZ4gA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UzdSy1cFJeP9YdiI8tZUAMUDFZ3u0qsakFwNfaudRxz9RfQ8hWJ0gayNxT4Z/6ufCCygMI7426ap6xc1pMsBRoVQr5ezq/e6ZC7vHBUcB1KFf9Pjgh2epP36/n5Skd6Wtgz/nTOpi+9RY6A86MExWx4i4uq9zddlCv6nJ3SIwGQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=4F5HMWix; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="4F5HMWix" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=ey5NM8CBmP9xc4LLpfl6+DouXpz8NtpPwdSJkTH6978=; b=4F5HMWixQfM03ALlk/hw80X2Qh fnFXRTYZ87cSL0aZH5WVx5UHLdBSpILxUwK/EljSWT/XZKWDC6tRAkrj6JwOcQSfO2NH0+WZVolhZ 9LealM8/6H4dUeSNUBiYltyHZjdg0Uvplvsc7Q1XMBjLFij6iQUpYTcHzF2oHplGVzLRegJiw3Lr4 zFvUMCeXiM4JgYXlfEiPr++0wi/d+oYMuFRFgdCuDG6Li+GkbuPGuM5CX4hq33pno3W6nO18Vlkx0 SoqXQDJ8vmbULNDf4ENkF98LuMWaAcCv1vttUcesYbLmbqppn/2Zv3lcPdKvE3x2pmVSzeL5xO+DK 94jWEYeg==; Received: from 2a02-8389-2341-5b80-b62d-f525-8e84-d569.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:b62d:f525:8e84:d569] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1st0Av-00000001SLW-2Of6; Tue, 24 Sep 2024 07:41:33 +0000 From: Christoph Hellwig To: Chandan Babu R , Carlos Maiolino , Christian Brauner , "Darrick J. Wong" Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 05/10] xfs: take XFS_MMAPLOCK_EXCL xfs_file_write_zero_eof Date: Tue, 24 Sep 2024 09:40:47 +0200 Message-ID: <20240924074115.1797231-6-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240924074115.1797231-1-hch@lst.de> References: <20240924074115.1797231-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html xfs_file_write_zero_eof is the only caller of xfs_zero_range that does not take XFS_MMAPLOCK_EXCL (aka the invalidate lock). Currently that is actually the right thing, as an error in the iomap zeroing code will also take the invalidate_lock to clean up, but to fix that deadlock we need a consistent locking pattern first. The only extra thing that XFS_MMAPLOCK_EXCL will lock out are read pagefaults, which isn't really needed here, but also not actively harmful. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/xfs/xfs_file.c | 8 +++++++- fs/xfs/xfs_iomap.c | 2 ++ 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 3efb0da2a910d6..b19916b11fd563 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -364,6 +364,7 @@ xfs_file_write_zero_eof( { struct xfs_inode *ip = XFS_I(iocb->ki_filp->f_mapping->host); loff_t isize; + int error; /* * We need to serialise against EOF updates that occur in IO completions @@ -411,7 +412,12 @@ xfs_file_write_zero_eof( } trace_xfs_zero_eof(ip, isize, iocb->ki_pos - isize); - return xfs_zero_range(ip, isize, iocb->ki_pos - isize, NULL); + + xfs_ilock(ip, XFS_MMAPLOCK_EXCL); + error = xfs_zero_range(ip, isize, iocb->ki_pos - isize, NULL); + xfs_iunlock(ip, XFS_MMAPLOCK_EXCL); + + return error; } /* diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 01324da63fcfc7..4fa4d66dc37761 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -1449,6 +1449,8 @@ xfs_zero_range( { struct inode *inode = VFS_I(ip); + xfs_assert_ilocked(ip, XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL); + if (IS_DAX(inode)) return dax_zero_range(inode, pos, len, did_zero, &xfs_dax_write_iomap_ops);